• 1. The tripod ring is customised according to the lens structure, the inner wall of the tripod ring is irregular ring shape, and cannot be used with Tamron Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD B061(X Mount & E Mount) lens, other lenses. Support lens rotation and vertical shooting • 2. The inner wall of the tripod ring and the lens contact surface is a plastic composite film, when properly installed will not wear the lens surface. You should not have a sticker on the lens surface to be mounted on. Peel off if applied Otherwise, it will affect normal installation • 3. The bottom of the lens bracket collar has a 50mm long Arca Fit quick release plate that can be used directly with the 39mm Arca Swiss Fit tripod ball head, panoramic head and clamp. More practical than lens support collars with no anticut • 4.On the bottom of the lens support collar there is 1/4" and 3/8" screw holes and stainless steel non-slip screws to secure the lens directly to the tripod • 5. Tripod socket IS-TA1830 + IS-3950PRO quick release plate converter (sold separately) compatible with Manfrotto construction water head